Smoking during pregnancy.
D001724:Birth Weight; D005314:Embryonic and Fetal Development; D005260:Female; D005313:Fetal Death / Q000453:epidemiology; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D008297:Male; D010920:Placenta / Q000098:blood supply; D011247:Pregnancy; D012907:Smoking; D006113:United Kingdom